Solution:

The blazer from man3 is on the boss's chair. So he is the boss.

Solution:

The kids have 4 slices of pizza in their hands but only three pieces are missing from the pizza box.

Solution:

The Yellow balloon.

Solution:

Person-1

Explanation:
Person-3: Some will say the answer to be person-3 as his body is floating in the water. But the question is do dead bodies float in water?. The answer is yes, but it takes at least 2 to 3 days for a dead body to float. In the starting 1 to 2 days, a dead body sink under the water, thereafter it starts floating. Thus, person-3 is not dead.

Person-2: There is vibration in the water. This makes us sure that person-2 is not dead.

Person-1: If you see closely, he is having a book in his hand and it is in the water. Also, he seems to be in a subconscious state.

So, the answer to this puzzle is Person-1.

Solution:

The number of differences is the same as the number of legs of the spider.

Solution:

The deer hiding in the trees.

Solution:

They are playing basketball with a soccer ball.

Solution:

If you zoom in, you'll actually notice that the building on the left is closer. The highly perceptive person who noticed the satellite dish was right all along!

Solution:

The bottom of the marked stick is colored.

Solution:

The rightmost one with the dirty shoe.